<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--action:提交地址-->
<form action="http://www.baidu.com">
    <!--placeholder占位文本
    maxlength最大字符长度
    value默认值
    readonly 只读-->

    用户名:<input type="text" name="username"
               placeholder="请输入用户名"
               maxlength="5" value="xyz"
               readonly="readonly"><br>
    密码:<input type="password" name="password"><br>
    <!--单选框 value设置提交内容 否则提交on
    checked默认选中-->
    性别: <input type="radio" name="gender" value="m"
               id="r1"><label for="r1">男</label>
    <input type="radio" name="gender" checked value="w">女<br>
    兴趣爱好: <input type="checkbox" name="hobby" value="cy">抽烟
    <input type="checkbox" name="hobby" checked value="hj">喝酒
    <input type="checkbox" name="hobby" value="tt">烫头<br>
    生日: <input type="date" name="birthday"><br>
    靓照: <input type="file" name="pic"><br>
    所在地:
    <select name="city">
        <option value="bj">北京</option>
        <option value="sh" selected>上海</option>
        <option value="gz">广州</option>
    </select><br>
    <input type="submit" value="注册">
    <!--重置按钮-->
    <input type="reset">
    <!--自定义按钮-->
    <input type="button" value="按钮">
    <!--通过button标签实现上面的效果-->
    <button type="submit">注册</button>
    <button type="reset">重置</button>
    <button type="button">按钮</button>
</form>
<hr>
<div>div1</div><div>div2</div><div>div3</div>
<span>span1</span>
<span>span2</span>
<span>span3</span>

</body>
</html>